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Dec. 7, 1948.
E. A. WAHL
’ 2,455,539 ‘' '
JOINT CONSTRUCTION
Filed D55. 29, 1944
‘
INVENTOR.
' ?es/v54 1414/”.
BY
I i
. M
ATZWRZYEY
Patented Dec.‘ 7, i948
"
r 2,455,539‘
“STATES PATENT‘OFHCE
i ‘ ‘Allied Chemical ‘Sq/Dye Corporationma. corpora
r FIHpplicationT‘December 29, I944,~;‘Serial No.1570,34li
‘ ‘
v1,4 Claims} (crass-3797.1)
“
rI‘his invention relates to construction;.»of ggas ‘
‘tight ‘joints, particularly adaptable f or‘ use in icon
‘appear ‘from, the‘ ‘following description ‘taken? . in
lnectiontwith ‘communicating gas conduits.
‘which‘Flg. 1 ‘shows in section a preferredem
' ~In¢the practice ‘of chemical processes involving
bodiment‘, and‘ Figs. 2-3 show “siinilarrviews of
the manufacture of gases and the handlingeof
“the same .in conduits ‘usually‘of relatively‘ large
“cross-section, it-‘is often‘desirable to provide a
wgasjlti-ght'joint inwatl‘gasline one‘section‘of which
is‘lmova‘ble “with respect to another. As‘ one
connection ‘with the accompanying drawings in
modi?cations.
‘
t
l
The improvementslof ‘the invention ‘are ‘par
ticularly adapted for use in situations in which one
pipe ‘section rotates and the other is stationary;
both‘ sections rotatebut one rotates at ahigher
lpracticaltexa-mple, > inrthel production of hydrogen‘ _
‘velocity than the other; and‘both sections‘rotate
.?uorideygas,‘:?uorspar and sulfuric acid are re‘
“but in opposite “directions.
“acted‘in a horizontal ‘rotary furnace to ‘form an
‘:‘I-lF-gaswvhich isadischarged from ‘one enduof the
vfurnacethruya short‘exit pipe which ‘is axially
‘
‘
i
‘ ‘Toiexemplifytutilitytof one embodiment time
inventionrFig. 1 illustrates application thereof in
‘connection with manufacture of hydrogenfluoride
y'alignednwith ‘the horizontal axis oi the furnace ‘p F gas. In Fig. 1, it indicates in section the gas out
an‘olrwhich is ?xed to and rotates'lwith the furnace
.let‘end ofra horizontal cylindrical furnace'rotat
¢shell.‘-» This‘ exit pipe ‘is connected by a joint" to
ably?mounted on‘ roller supports, one of which
t-astationary flue serving to iconductlth‘ergas stream
?appearsiiat ll, ‘Exit pipe ‘section “iris-?xed to
ttoylthe subsequent gas puri?cation‘and HF re- ‘
rcovery stages'ofthe‘process. ‘\Whilethe pipe rat- ‘
‘and rotates‘with the furnace.
this particular
apparatus-‘the end, of the ‘main gas conduit M‘is
stationarytand-issheld imposition by a support
“taclhed; tow and rotating with the‘ furnace; and“ the
stationary; gas main‘ are jjdesignedlso as :to be at
(5. Whilepipes Edit-and Mappear coaxial ontthe
least theoretically coaxial, ‘it is‘well ikno‘wn‘tha‘t
drawingrit ‘will beunderstood that, ‘because of
irregularities ‘arising from wear and tear and
‘warping caused by heat, the axis of rotation of
‘in1 actual operation ‘these‘pipe sections are almost
‘gal-ways out :ottalignment to some greatergorg lesser
extent.‘ ‘In the past, this circumstance has caused
tconsiderabletdi?iculty in connection with the con‘
‘struction of leakprooflijoints between the ?xed
and ‘rotating pipe sections,‘ The usual packed
gland type of joint has ‘provedinade'quate,’ partic
ularly after the apparatus has been inuu‘sefor
sonic period of time. ‘Tendency ifor gas‘leahage at
‘the ointiujhas-l beenlso ‘ pronounced that; particu
larly in he manufacture oftnoxious gases, it has
“ furnace H! is variable, and in operation the axes
(of pipes it‘ and M are almost ‘always out of align
ment which ‘results in a substantially continuous
‘eccentric rotation of pipe 13. ‘Further, wear ‘and
tear on roller‘ H and the associated track causes
pipe 13 to have atsmall but appreciable axial
‘ movement relative to ?xed pipe M. Both of these
movements contribute to gas leakage at the con~
‘ ‘nection between the pipe sections. In‘ accordance
“been the practicef-almostuniversallyto operate ‘at
lwithgthis invention ‘the‘foregoing difficulties are
“least (‘the gas a generating “portion ‘of 1 the system
overcome by provision of 'a joint constructed so
‘tundennegativepressurein order to‘ prevent escape
asto permit relative eccentric and/or axial move
ment‘loetween‘ the‘ adjacent pipe sections, and
‘of harmful gases to‘thelatrnosphere andia‘void in
at the same time prevent escape of
if the
.joint; constructionsvof‘previous design have not 40 furnace is operated‘under positive pressure or‘to
‘prevent theingress of air if the system is operated
rbeen : ‘gasproof, ‘ the ~ result ‘ of - negative ‘ ‘pressure
jury to ‘workmen. Since commercially available
operation has been in?ltration of ‘air‘thru‘the
connecting‘joint tovsuchr'an extent as to dilute
‘the gas stream as much g-as 50% ‘by volume. ‘This
difficulty requires the use ‘of gas ‘puri?cation and
recovery apparatus substantially larger than‘
“would'be needed if in?ltration‘ of air ‘from ‘the
atmospherellcould be avoided.
_
I
l‘
‘
(This invention aims to“ provide a "construction
which affords a gasproof seal between two appara
tus elements, ‘at least ;one ‘of‘w‘hich is‘ movable
with‘ respect to; the other, even if such elements
:are substantaially outtof alignment during opera
tionnd‘p
a i;
intentions
.under negative pressure.
“
l l
‘isshrun‘k onto‘the outer surface of and ‘rotates
‘with pipe ‘I3. Numeral‘24 indicates a‘ generally
annular shaped sealingmembrane the bead ~26
of which is fastened to vflange 22 by an annular
ring‘ 21 "and boltsZB; The bead ‘26 ‘may he *Ofv?IlY
‘suitable length radially, depending upon "the
particular installation. In cross-sectionhmem
‘ brane 24vis‘semi-circular and‘provides‘a‘sealing
its objects and aaanaasiwm .55 lfacetll in“ the form of a convex arc.
l‘
‘
“ lf‘ixedin gas-tight relation on ‘the end of pipe
I4, taslby welding, is an annular‘diaphragm l8
providing a plane, non-?exible sealing face [9 of
substantial radial dimension. Annular flange 22
“Ther‘entire
2,455,599
3
membrane including the ‘bead thereof is made of
any suitable ?exible and preferably abrasion-re
sistant material, for example, its construction and
composition may be the same as those of a motor
truck tire; thus it may be made of rubber with a
fabric carcass. When the present improvements
are used in conjunction with apparatus employed
4
?lled with water or other material serving to
lubricate sealing faces I9 and 30, and to cool
the ?exible membrane assembly as it rotates
with pipe l3.
The invention is subject to several modi?ca
tions. For example, in Fig. 1 the relationship
of the operative parts may be reversed, that is,
diaphragm l8 may be ?xed to and rotate with
?uoride, the rubber constituent of the membrane
pipe l3, while ?exible membrane 24,, springs 4|,
is entirely of butyl rubber, or at least the bearing 10 backing plate 38, the adjusting studs and their
surface of the membrane is provided with a butyl
supporting disk 33 may be ?xed to and remain
stationary on pipe M. The sealing construction
rubber layer of suitable thickness, since it has
been found that this material is particularly re
may also be applied to the solid residue outlet
sistant to the acids such as hydro?uoric and
end of a furnace as well as to the gas outlet end.
sulfuric, and also possesses the required properties 15 In this instance, as shown in Fig. 2, the only
of ?exing and resistance to abrasion.
modi?cation necessary is that pipe |3 be pro
vided with a ribbon conveyor 55 which discharges
Annular disk 33 is welded to pipe section I 3 and
solid material into ?xed conduit l4 terminating
rotates therewith. The disk is formed with a
in a downwardly directed passage 56 provided
plurality, e. g. four, of sleeves 34 into which are
threaded studs 35 of such length as to permit 20 at its lower end with a conventional air-lock
substantial axial adjustment. A ?oating annular
not shown.
‘
backing ring 38 is provided with a corresponding
Fig. 3 illustrates adaptation of the invention
number of cylindrical sockets 39 each of su?icient
to} prevention of gas leakage at the connection
inner diameter to receive loosely the end of a stud,
between a reaction chamber and an associated
and of su?icient depth to permit support of the 25 rotary element. Numeral 60 indicates the side
ring 38 on the ends of the studs. One end of
wall of a, stationary reaction chamber in which
a gaseous reaction may be taking place. Wall
each of a plurality, say eight or twelve, of com
pression springs 4| is welded to the backing ring
60 is provided with a circular opening 6| thru
which projects a shaft-like member 63 which
38, and the other end of each spring is welded
may be a rotary agitator shaft or a rotary elec
to the adjacent surface of an annular bearing
in the manufacture of gases such as hydrogen
ring 44. This ring is preferably of rectangular
trode such as is used in some chemical opera
cross-section and of such width as to form an
tions. The shaft bearings, means for rotating
the shaft, and insulating facilities if member 83
unobstructed annular air pocket 45 between the
ring and the inner concave surface of the
is used as a rotary electrode, are not shown.
membrane.
35 Bolted to the face of wall 60 is a sleeve 65_on
the outer end of which diaphragm I8 is secured.
In operation, studs 35 are adjusted to move
The ?exible membrane 24, stud supporting disk
the plane of backing ring 38 far enough toward
33 and the intermediate associated parts are then
pipe section |4 so that springs 4|‘ and bearing
?xedly attached to shaft 63 in the same man
ring 44 exert enough pressure on membrane 24
ner in which such elements are secured to pipe
to form a gas-tight seal between the convex face
of membrane 24 and the adjacent plane face IQ
I 3 as shown in Fig. 1. It will be noted that, since
the diameter of shaft 63 is substantially less than
of diaphragm l8. Since membrane 24 and dia
phragm l8 are connected in gas-tight relation
the inside diameter of_ sleeve 65, the shaft and
to pipes l3 and I4 respectively, the seal formed
sleeve are arranged in non-gas tight relation,
by contact of sealing face 30 of membrane 24
and that‘ annular passage 66 provides ‘a port
and ?ange |8 closes off the annular port 41
thru which gas may egress or ingress. It will be
through which gas normally egresses from or
seen'that the construction illustrated in Fig. 3
ingresses to the gas stream being fed into con
affords room for substantial eccentric and axial
duit M from furnace l0.v The adjacent ends of
movement of shaft'53 without breaking the seal
pipes l3 and M are out of metal-to-metal con
formed by diaphragm |8 and membrane 24.
tact, thus permitting relative axial motion, and
I claim:
the radial dimension of annular port 41 is sub
1. A pipe joint comprising communicating
stantial in order to permit a relatively large
pipe sections having adjacent endvdisposed in
eccentric movement of pipe l3 with respect to
non-gas tight relation and arranged to facilitate
conduit I4. The large radial dimension of dia- ’ passage of a gas stream from one section into
phragm l8 permits substantial eccentric move
the other, at least one of said sections being ro
ment of the circle of actual contact between seal
tatable about its axis, a diaphragm associated in
ing faces l9 and 30. The convex sealing face
gas tight relation with one of said sections and
30, the ?exible nature of the material from which
having a sealing‘face, a ?exible membrane asso
the‘ membrane is made, and the unobstructed
ciated in gas tight relation with the other sec
pocket 45, all cooperate to permit, on eccentric
tion and having a convex sealing face adapted
movement of pipe | 3, a slight rolling of the
to contact said first named face to form a gas
curved face 30 over the plane face |_9 thus pro
seal, and resilient means for maintaining said
viding a relatively broad annulus of actual con
sealing faces in gas tight contact whereby egress
tact and avoiding any tendency of such faces
of gas from and ingress of gas to said gas stream
to pull apart and break the seal. Being ?exible
itself and ?exibly or hingedly connected to pipe
l3, membrane 24 affords means for absorbing
axial motion between pipe I3 and conduit |4.
Bearing ring 44, because of its spring suspen 70
sion, is readily movable universally, and hence
changes in its vertical position do not interfere
with maintenance of steady pressure of springs
4| holding the sealing faces in contact.
Numeral 50 indicates a trough which may be’ 75
is prevented.
'
2. A pipe joint comprising communicating pipe
sections having adjacent ends disposed in non
gas tight relation and arranged to facilitate pas
sage of a gas stream from one section into the
other, at least‘ one of said sections being rotaté
able about‘its axis, a diaphragm‘ associated in
gas‘tight relation with one of said sections and
having a sealing face, a ?exible membrane asso
ciated in gas tight relation ‘with the other sec
2,455,039
tion and having a convex sealing face adapted
sage of a gas stream from one section into the
to contact said ?rst named face to form a gas
other, at least one of said sections being rotat
seal, and adjustable spring actuated means for
able about its axis, an annular diaphragm ?xed
maintaining said sealing ‘faces in gas tight con
in gas tight relation to and extending outwardly
tact whereby egress of gas from and ingress of
from one of said sections and having a sealing
gas to said gas stream is prevented.
‘ l
face of substantial radial dimension, a ?exible
3. A pipe joint comprising communicating pipe
membrane hingedly connected in gas tight rela
sections having adjacent ends disposed in non
tion to the other section and having a convex
gas tight relation and arranged to facilitate pas
sealing face adapted to contact said ?rst named
sage of a gas stream from one section into the '10 face to form a gas seal, and adjustable spring
actuated means for maintaining said sealing
other, at least one of said sections being rotat
able about its axis, an annular diaphragm ?xed
faces in gas tight contact whereby egress of gas ‘
in gas tight relation to and extending outwardly
from and ingress of gas to said gas stream is pre
from one of said sections and having a sealing
vented.
face of substantial radial dimension, a ?exible 15
EUGENE A. WAHL.
membrane hingedly connected in gas tight rela
REFERENCES CITED
tion to the ‘other section and having a convex
sealing face made of butyl rubber adapted to
The following references are of record in the
contact said first named face to form a gas seal,
?le of this patent:
and adjustable spring actuated means for main
UNITED STATES PATENTS
taining said sealing faces in gas tight contact
whereby egress of gas from and ingress of gas
Number
‘ Name
Date
to said gas stream is prevented.
1,859,975
Malkin __________ __ May 24, 1932
4. A pipe joint comprising communicating pipe
sections having adjacent ends disposed in non
gas tight relation and arranged to facilitate pas
25
1,934,717
2,038,855
2,361,811
Johnson ________ __ Nov. 14, 1933
Rosenblad _______ __ Apr. 28, 1936
Badger __________ __ Oct. 31, 1944
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